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E4422B Acc File

I'm using this Sig Gen Agilent E4422B as standard to test the Spec Analyzer and METCAL 8.1 has no FSC for it. How do I create the Acc file to run the procedure? Can someone help guide me through? I've read that I need to create an Excel file to begin with but where do I get the template? And what's the next step?

Please help. Thanks.

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William Green

The Agilent E4422B is listed as an 'HFSG' Flexible Standards. You can use the 'HFSG' FSC to control it. As far as an ACC file goes, I've never tried to create a new one. But taking a similar one and modifying it in Excel might work. ??? Worth a try.

You can also use the ACC statement ACC = ???. Help on this is in Met/Cal Editor. Type a line: '1.001 ACC'. At the start of the line, click (F1).

 

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Michael Johnston

I've attached the xls template I got from the Advanced MET/CAL Procedure Writing course.

Just create your acc file in that sheet, save it as a .prn file (Formatted Text (Space Delimited)) and then change the extension to .acc

Attachment not imported: 2638.xls
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Tam Tu

Mike,

Thank you for the template but I got more question to ask for help. After filled out the Headers, I'm confused of what to put in for this Sig Gen output 250KHz - 1GHz @ +13 to -136dBm output.

 >1 to 3GHz @ +10 to -136dBm +/-0.5 for up to -127dBm, after that +/-1.5

>3 - 4GHz @ +7 to -136dBm +/-0.9 for up to -127dBm, after that +/-2.5

How to organize and translate these specs to Nominal, Mod1, Floor, etc?

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Tam Tu

Bill,

I've never used the HFSG FSC and I could not find this in the manual. Can you explain how to use them?

 

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Michael Johnston

If you look at the default acc files for some of the other generators, it might help. The 83630b.acc file should be in the folder where your install stores them and it would be a similar one.

Basically, your Nominal field is a range of level outputs in dBm, your Mod 1 is a frequency range, Tol will be 0, and your floor will be the spec. Example:

    # NOMINAL          MOD1            Tol.  Floor  Res.
    #----------------  --------------  ----  -----  ----
    -136   -127        1e9        3e9  0     1.5    0.1
    -136   -127        3e9        4e9  0     2.5    0.1
    -127   +10         1e9        3e9  0     0.5    0.1
    -127   +7          3e9        4e9  0     0.9    0.1

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Tam Tu

I found the 83630b.acc file that you've suggested but couldn't open it. Can you advise? Thank you for your guidances.

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Michael Johnston

Right click, open with, Notepad

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Tam Tu

That helps. Thanks.

Another question, how to determine when to use "Tolerance(%)" and/or "Floor" for specs?

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Michael Johnston

It just depends on how the spec is being expressed. A Tolerance would be in terms of the set value (percent of reading) and the floor is just a fixed spec, like the +/-0.5 dB, for example or +/-0.1 V(dc)

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Tam Tu

I think I understood that now. 

What about pmm specs translates into the Tolerance column like the specs for the Internal Reference Oscillator below?

Stability                           ESG-A and ESG-D                         ESG-A and ESG-D series standard series Option 1E5

Aging rate                      < ±1 ppm/yr                                      < ±0.1 ppm/yr or < ±0.0005 ppm/day after 45 days

Temp. (0 to 55° C)        < ±1 ppm, typical                             < ±0.05 ppm, typical

Line voltage                  < ±0.1 ppm, typical                          < ±0.002 ppm, typical (+5%, –10%) (+5%, –10%)

 

And another % combines with +20Hz (fixed spec?)

Deviation accuracy

< ±(3.5% of FM deviation + 20 Hz) (1 kHz rate, deviation < N x 100 kHz)

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Michael Johnston

Just convert the ppm values to % by multiplying by 100 and put them in there. So 1 ppm would be entered into the tolerance field as 1e-4

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Tam Tu

Thank you for your help. I've got the procedure running with the proper acc file.

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Michael Johnston

That's great news! Creating your own acc files is a pain in the butt, but once you get the hang of it they are so useful.

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